Yes, for the older ones it's hard to imagine unprotected sex within a casual relationship following the waves of HIV warnings that we all were exposed to. However, the younger generation has not been part of the HIV panic that swept the globe some 20 years ago now. As a result, they fear unprotected sex less and with that comes increases in the common STDs such as Chlamydia and Gonorrhoea. In addition to that, new generation HIV strategies in America such as PrEP https://www.cdc.gov/hiv/risk/prep/index.html has removed some of the fear of contracting HIV when those at high risk can take a drug designed to reduce their chances of infection during unprotected sex. They may have less chance of contracting HIV but they have more chance of contracting Chlamydia, Gonorrhoea and Syphilis. This increase of infection rates of common STDs has led to new testing solutions such as rapid test kits as well as free walk-in testing clinics in some states. Still, the most private and convenient testing method is to use home test kits for the common STDs. And, why not just for old times sake, use a condom.